Nonpoint source pollution is difficult to control because it a. comes from a direct point of origin b. comes from a variety of sources c. remains the same over time d. none of the above

Ameadow ecosystem includes many species of grasses and small shrubs, several herbivores, and a few carnivores. a fungus colonizes the meadow and kills most of its vegetation. what is most likely to happen to the populations of herbivores and carnivores in the ecosystem? a. the populations of herbivores and carnivores will increase because there will be less competition for chemical energy. b. the populations of herbivores and carnivores will remain stable because the fungus cannot infect these organisms. c. the populations of herbivores will decrease because of vegetation loss, but the population of carnivores will remain stable. d. the populations of herbivores and carnivores will decline because less chemical energy will be stored in the ecosystem.

Which osmotic and ionic strategies must marine teleost fishes employ?

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is